| 摘要 |
A gas turbine engine rotor assembly such as a fan (14) or compressor (16) includes fan blades spaced axially from stator vanes (46) inside an annular duct (55). A controlled air blowing system (54) is secured to the annular duct (55) and adapted to blow a hot air flow (56) in a direction opposite to the rotation of the fan blades into the annular duct (55) between the fan blades (14) and the stator vanes (46), to impart an opposite rotational momentum with respect to the air compressed by the rotor blades, in a asymmetrical pattern to interfere with or destroy a symmetrical pattern of the blade rotation-wake of the compressed air, thereby reducing the strength or preventing the generation of the spinning mode so that the fan-stator interaction tones are significantly reduced.
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